mirror of https://github.com/a2-4am/4cade.git
63 lines
1.6 KiB
Plaintext
63 lines
1.6 KiB
Plaintext
;license:MIT
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;(c) 2021-2022 by Frank M., qkumba
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!cpu 6502
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!to "build/DEMO/AO#06B900",plain
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*=$B900
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!source "src/constants.a" ; no code in these
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!source "src/macros.a"
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+ENABLE_ACCEL_LC
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+LOAD_XSINGLE title
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lda #$60
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sta $604E
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jsr $6000 ; decompress
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lda #$4C
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sta $4FD7 ; exit on keypress
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sta $4F96 ; exit at end of demo
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ldx #0
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stx $4FD7+1
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inx
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stx $4FD7+2
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; doesn't try to detect joystick or joystick buttons
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lda #$D0 ; disable sounds
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sta $0DA0 ; A-P-P-L-E-O-I-D-S
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sta $1118 ; alien
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sta $111F ; alien
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lda #<callback
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sta $4F96+1
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lda #>callback
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sta $4F96+2 ; wait 10 seconds at end of demo once Twilight logo is shown
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+DISABLE_ACCEL
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jmp $4D00
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callback lda $C000
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bmi +
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lda #$FF
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jsr $FCA8 ; WAIT 0.16395694 seconds
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dec count
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bne callback
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+ jmp $100
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count !byte $3D ; number of 0.16395694 second WAIT cycles
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; (A*A*2.5 + A*13.5 + 7) * 0.980 usec
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; 163,840 + 3,456 + 7 = 167,303 * 0.980 usec = 163,956.94 usec
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; 163,956.94 usec = 0.16395694 seconds
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; 61 cycles (hex $3D) of A=256 WAIT = 10 seconds
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title !byte x_e-x_b
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x_b !text "AO"
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x_e
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!if * > $BDFF {
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!error "code is too large, ends at ", *
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}
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